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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ad49d221abd52e704a9b340d022ba4f2fb4be9b4f13317161a8e3c51fb2011e7' 
  AND token = 'xTRFVxcE/7Tb87TknGw9HgthMIU+Dbh6LGkCpiUFcis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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