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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c2da15a66a4b376d0060b3cf53176b32a2e81d2f95eb439a7e6fe38a6661da6' 
  AND token = 'ilacqkTQ8j2fbQ4XcpK3Ydbr47ZVitEEBiuoem6yBYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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