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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'de07c77b315af575e155cd09d0d6f1bb25dd032fc2cd8c22d58f938ba0447eb8' 
  AND token = 'KP1SX+ut/7bLOQoHRvZaZsNmvAKgycGlt6DmMalEpUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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