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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '50c6641e6ab8eaa4b64241913b29cd658733b61310012541004e03bf8b84723a' 
  AND token = '/am1WcqEOdQHBHDyinrU4KY3SlniPcAWGu58nMvOsVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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