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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd9c511f5029c236c8bc18de4155053581fb57e35356d61ba519b8b2d6ba078a' 
  AND token = 'lofMPH5tlJNs7oBCihSBdyG2BXOIPMRoh0JyJznJ/PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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