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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '619210374127d6ddea71da7b7156ed9dfbacb747effdf8e11824277627ba089e' 
  AND token = 'JsFGJVuGu/HfoVaUFlEkQ5dgUyMooWbvmcQTdD/odoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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