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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5779ade129eb138baec0e410f31e5a2435e7ca4c4374aa53a586ed5c3f969260' 
  AND token = '1ruYoen0bHySzjVvXQkWH+UNrO2ON/0Sk9/ZUZt5Ib0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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