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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff166c40aab3c2025814ca02e667a94799a27c5aeeed8689b716df3e538224fd' 
  AND token = 'Rx3EWVHXqxi0xc5hm39ERN+GZ3ovFA6WKkF67WO7pWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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