SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e019f57d7e0b1fb3221e5f3aead4979451cf8d8a5216e3e122bfe3ad7571e2e' 
  AND token = 'qzMUXVC4Czp/MFVH7jZW8h+kquv9al+5yPF3JPt3lX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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