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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d496784839679045625e2211087e06053014ed98f49c67196f06055570b9e38' 
  AND token = 'BaXHf9c8IzRurm9cVdyS5oiChcbq/Sb00XAlqa0ZVWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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