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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bcb13aabe98e7097ffa456d151c02ecd559c4f6ad9e21a5d5179da69fc90927c' 
  AND token = 'Izhc0riMKpWkFkm8l6mPwxELuitbreFGzJ7RTAKXUew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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