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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '03bff4888d41d4efcebef2c5144020d57007db4b705f57fdaebdc79df670c00a' 
  AND token = 'HxoMVA6mnXO3jnFr0PmDl/PlOcUO+lBQGGCFYyK9dVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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