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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8485ba65005b50acf63a5007b3703e87c57167cce2d376ab47b1872b76c23a4' 
  AND token = 'xvQKtEG0E6u6xkxejLZk2zSpLPlxohUfBwUNSiMDRHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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