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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '85df24761af08f011545f4850ef92d24daf35d1fca26b25eb38770f2da9a15ce' 
  AND token = 'Sm3blslXj/jrumFs0Ne85jTjtfMALbNOgpioYC5YjtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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