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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '39033ce65b35660ac8935e0898502eb21416b3fecb0b3346f0800ff9abb04daf' 
  AND token = '6tkR3UaOxHg2n3kalXLsSW9bIxWqt+MzxQCDiPIv80o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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