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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e78ff4eea200f1a2ed11f60b51c4a63627531d8e10d38ffb308944ac985d5ca8' 
  AND token = 'w82Kgruj8DpeGSg6Z0IeW/IHXjGepLcjf155QcgB1H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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