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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf7fdec81d412bd36b7f7a3290e81dee509ad7368cb520bb65200277f033280a' 
  AND token = 'eMxtFnOZRo6W83OXBJw87WFMc9NqKrcVJqvqboiLXA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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