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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'edb017f9b2d08794b58a7550376ba8881985dbdf3d590fbd9f191d94d58dd6f8' 
  AND token = '6p59qBF1ZKZYWZB06/7Dy2/42fr9VzWGs0YYcfXCsek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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