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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f023b5a0ff32d31d398a858c13e00e8996c596e7e25e424ed63ad05fa3e6f932' 
  AND token = 'CAaP8iFMm4vbd0kLjd3hoSjn3c1aGoNpreYYNc9C3Go=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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