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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92809c851cb516d290e36d4e292379d79f5418e96ac4653f0bbc35d6b4968a94' 
  AND token = 'q3lAxLjJJeElf9nx9UJD88O+FctVFuOxU8kKbkSrDGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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