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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e9dda2ca4a2b1eb44a17898c9e89e12ef161a7dbdaee82650708f2ac3b0e21e0' 
  AND token = '+gmtRWtwexwgxB7jo8EkalnSHU7BOn14yz1XTTxPvx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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