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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '61eef761f44b0ed6739a6b4efa7e951bf3f11d8f9ab7ea69b2389b2e79ea393b' 
  AND token = 'o951TlQ7wWPfyaHBDp5tZtA6Mijn1/6U0yMM8rWzyDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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