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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b15b56a5fc41762b6de8cde8c88e6d22251d819002ac96be828b00fb226700f' 
  AND token = 'RLybAC3P36If9MkDGuPmboOXPZQljaEiYG1CMT4k4BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}