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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e495489c966df65b268164fa3dc983b47a4afe98d8fd69cfac625fb66c3854f' 
  AND token = 'af/DFuZsNXk4q3Gez2kbPuf+faHFpppOh1suzTc0Ue4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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