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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '799cbb79bfd6ccc3838c3531ce7a42d8d33e32e987ecb13e7a9a78a9fc7651e2' 
  AND token = 'svkBTD4Kw5nETt2IUybujhuH3yzmkzm6tN20GI1Z7to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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