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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e824f8548fe6bde63885fee72dfc31b1ffbeb860acb1fcfe80e074f431a47aa' 
  AND token = 'r0no20Sk7hjf/g2rqRqq3mgF5nkkr2K1nfxWzpd/Ilo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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