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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4767574bfe4a99655d02e81d57b8d17ab9e0f183dc7e7b98ecddd4e74fd6585e' 
  AND token = 'W8g5Q988zVyR46GHburBE9HA3wZ+uchuqwaHhkcBjlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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