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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf23155c8323e26fcb9a1a1054fce6f42ee69bef63f7092569a0c1902b4b8f87' 
  AND token = 'DBuuQJn38fAqnFx/8vkN6yChCXi93mHjqnTsIEL9SsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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