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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cb52bb0eaa587ae562658cad2525cd0e6bede435c822312df519740d2c0caac' 
  AND token = '9NoQ5tcZYHBXhW0GH3m47Qq04mvr9Ef1it2YrpX0mIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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