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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c30907ee362303fe9b0af6e342c385dbb36729b687c3f8d7b5b96cdca461493b' 
  AND token = 'RD8+orxxBRFWHgYsbBF7d5rir6t1BsSmI9iFn2n5R84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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