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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cbb26ff9c17acee46bb6adf9366e0daedac87a90582a52d4e3d9fe02fb766c20' 
  AND token = 'GyDzlpyBjpk6bMMhmByVf1zyOL2rZ+JOpaZEupaw5Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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