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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd27f1c2bd5d13a6a79d04c5de9fb83acfd819303de94e42d084bd2e3dddb282' 
  AND token = 'wcMfSkkEt+7qgBdCEHlv+gUNFJtgZKApyw20ivLjRpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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