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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6805c979db3c194fb826d7b2abb71c199610e351178abce87dbcad129e99b6dd' 
  AND token = 'DpkrlM2RMHcAcj0MRmGvGQBa2GJLD0CxzaEeunpz54c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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