SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fb48db94a2cb4b153cf70243e266879b28ac62feab9f225891e5f142f0577ed9' 
  AND token = '/XXlwDEqnp27huPbf2R7jKsIbFoqPoRLR+jWYp20Z8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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