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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4aa43d216818f3cab07b969b9de26b26479b3c30567190320ed5b8129ffd5518' 
  AND token = 'HUHvEjxLefpiXrJkMaTbkhfMhlfvigUpcrA1PvEyaZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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