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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8833218f66428bd541f290a9a9550ab0679c9e5c8bd3384eb24bc32e0f054c0' 
  AND token = 'quEbKYchsH6GzFTEN03420KA9zGd7K4x+mW4PbRsrBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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