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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bec0e0b8d33bdcf1ecf7ade662d7a591eac8f17f800bd5a405821b574830ef9a' 
  AND token = 'BHkSPk59foc4raCxSWVyEa6vld2CreOypCJ8zDqnvS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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