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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f17ed10dcf37449ff182d9d7a11aaec56d2bb6f46dcb38548027e86254ad2f8' 
  AND token = 'LomKup/y6VR5FWS3fjHrhp/HLk/tj87ulMwiQ78pM6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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