SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '185e1c134ad32fb3d1b8027a5bafa9669dc253f00f500c9b52db659f44fa4da7' 
  AND token = 'wCm7GvvbJrd4q7ivgVRi8ngJaOF7K6Kdofz0AnGB4pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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