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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f93abfb59691adcb04c5ddee3d139f090c86a9e3614e9a8bd8576edd0401c2db' 
  AND token = 'Xz/pS7JlzpwvYaQ0kO/cgaLc/7rs8ESeMH1GA6dZKao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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