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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a8e389f85afb454d060d494d0a398c1aec455b8c19b53e8bb9c4b7e1c3510f4' 
  AND token = 'oXqOfkC4Ssvauia1mJNk/FpC9k+3BfblYdMwktPfGXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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