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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a98aec1e5940b0adb42fa29f9e3baec7d9e3e348783c9595512e5ca4dfe0b4c3' 
  AND token = 'dRwcok8wccvLJSv/42mI6PqQiPR1i/NYlx81phtZAm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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