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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdfaec7b0fc7f88e9a9867797995516b27600ef4ba439cce4f58de53ac8c8386' 
  AND token = 'gbHalKMd/tL7ia7bfQnjHDec4Ssf/qTKEaPmzNgFNA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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