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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0cb611ab0b1dcd63fefd155d8e82479eeb8c037940e902ef8fbb25b1e88b4ff' 
  AND token = 'Qn863Y4TRTUfQgfQ1GT4UdAUqoOVnGIk3Dlrr6kqASg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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