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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e3e207b574997917dfd853a4ee2246f020b93b9ce8c10a37f89873e8eedc31a8' 
  AND token = 'fdWswXqkJotb6VtNtIFy75jogY9R3VrBr2jKeV8dIbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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