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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10ec6e78bba2f277d00f518d4846ed647b5e947ed7e310b2a87d9f93d8d7747c' 
  AND token = 'thUYzlM3NCIkkJqHxHeAfPhH996oxqU4JTM7BY7QmgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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