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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cc4f9eeb4afdedd026622558ec656e148038db44507ebf0381b8c4271574a80' 
  AND token = 'YPado27vse8jyPGjQFdFCDwfaC5Wb4CtalemB+drfvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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