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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b9484eb9f45c3ea95b4ccc0043d664b69997991c4b83faa79726d3eb4a235133' 
  AND token = 'cN4Xdq8SjVx0NNUiVU3xeLONG9BHFCmKSgfczngtD30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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