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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4edb5e97970de2c239a153f973fcfbd166520e2881fad0eb77a6b35580386bd' 
  AND token = 'rcFA8Vaeo/vM0USRtLO4M4l+mMtVvSl11Ugu5dTgI+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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