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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c376fde2415e41bfc9b777bfb06e47deefb3894c7d6e642856beea9a138de0c' 
  AND token = 'm1gIVBxMgr4dzofgI9yYpSgxCJ8FNro69BsG1ZSAr2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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