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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '34120ba321e2abf683282a2ab0f67d8ba456984441108b0dd77f840a7e4a0f48' 
  AND token = 'NdQvNW2Xrq2ZXQFxRdbWeVSGgfE24QQtCFzzO+bX6Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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