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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '20dc239a5a8839d8d09504356820c938fde684e2a5f376eb89d94030b9a4ec3c' 
  AND token = 'ukifHmItZ3KkFkJw3Vss0LuVyHVMoLd8D2XOPPBQGRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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