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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e7371ee5259110bd9f06f21712ed358407efe71c66c46dcdb127b8aa1d7ba81' 
  AND token = 'V8hPK4ZbO2+pAlZFtxatLaAPllFiqX04AEw8oDb14AI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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